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Background and purpose: Epidermal growth factor receptor (EGFR) has been implicated in cellular responses to ionizing radiation and represents a major target for current radiosensitizing strategies. We wished to ascertain whether a correlation existed between the expression of EGFR, transforming growth factor-α (TGFα) and platelet-derived growth factors A and B (PDGF-A and PDGF-B) and treatment outcome...